Pump.



No, 856,215. PATENTED JUNE 11, 1907. J. BERGSTROM & 0. A. WAHLEEN.

PUMP.

APPLICATION FILED SEPT. 27, 1906.

rs: NORRIS PETERS C0,, WASHINGTON, n. c.

- the improved pump in front elevation.

UNITED STATES PATENT FFTQF.

PUMP.

Specification of Letters Patent.

Patented June 1 1, 1907.

Application filed September 27,1906. Serial No. 336,442.

To (ZZZ whom, it may concern.-

Be it known that we, JOHN BERGSTROM and CARL A. WAHLEEN, citizens of theUnited States, residing at WVashburn, in the county of Bayfleld andState of Wisconsin, have invented certain new and useful Improvements inPumps and we do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

Our invention has for its object to provide an improved pump, and tothis end it consists of the novel devices and combinations of deviceshereinafter described and defined in the claims.

The improved pump is illustrated in the accompanying drawings, whereinlike characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 shpws 1g. 2 shows the pump in sideelevation. Fig. 3 is a vertical section taken on the line 00 r of Fig.2; and Fig. 4 is a vertical section taken through the pump on the line90" 90 of Fig. 3.

The body of the pump is in the form of a cylindrical casing having, asshown, a detachable face plate or head 2 secured thereto by machinescrews 3. This casing 1 is adapted to be secured to a wall or othersupport by means of screws 4, shown as passed through. perforated lugs 5on the peripheral portion thereof. A water supply pipe 6 leads from asuitable source of water supply and opens di rectly into a port 7 formedin the bottom of the casing 1. This port 7 is normally closed by a checkvalve 8, preferably of the flapper type, which readily opens to permitan upward flow of the water from said pipe into said casing, but closesto prevent a return or reverse flow.

Within the casing 1 is a segmental flange 9 that is concentric to theaxis of said casing, and is spaced apart from the lower peripheralportion thereof, so as to form a segmental piston seat 10 which, asshown, and preferably, is rectangular in cross section. The said flange9 preferably extends through about 180 degrees. close to but on theopposite sides of the port 7, are check valves 11 which open up topermit the water to flow in either direction from the central chamber 10formed between said valves 11 into the piston seats proper.

'Working in the two extremities of the seg- In the piston seat 10,

mental piston seat 10, or, in other words, within the two piston seatsproper, are segmental pistons 12, which pistons are connected by asegmental piston stem 13 carried by an arm 14:, which arm is secured toand carried by a short rock shaft 15 journaled in the back plate and inthe face plate of the casing 1. To the forwardly projecting end of therock shaft 15 is secured an operating lever or pump handle 16. Thepistons 12 are open at their inner portions and are preferably formedwith slots 15 that extend nearly to their inner extremities. The extreme inner ends of the said pistons, how ever, are provided with checkvalves 17 preferably of the flapper type, and which check valves open upwhen the pistons are moved toward the respective check valves 11, butclose when the said pistons are moved in reverse directions. A valvedfaucet 18 opens from the casing 1 through the face plate 2 thereof, froma point above the segmental partition 9. Otherwise stated, the saidfaucet or outlet pipe opens from the central or main compartment of thecasing 1.

The action of the improved pump, briefly stated, is as follows: When oneof the pistons is moved toward its cooperating check valve 11, the otherpiston is moved away from its cooperating check valve. When the pistonis moved away from its cooperating checkvalve, water will be drawnupward through the pipe 6, through the port 7, check valve 8, chamber 10and check valve 11, and will fill the corresponding piston seat 10. Whenthe said piston is then moved toward the cooperating check valve 11, itscheck valve 17 will open and permit the said check valve 17 to pass to aposition close to the said cooperating check valve 11. Then, when thesaid piston is again moved away from the cooperatlng check valve 11, itscheck valve 17 will be closed, so that not only will the water be drawninto the piston seat below the same, but the water above the said checkvalve will be forced upward and into the mainchamber of the casing, andthe said casing previously having been filled with water, the water willbe caused to flow out through the faucet 18, the valve of the saidfaucet, of course, then being open. It will thus be seen that under bothstrokes or movements of the pump handle or lever 16, water will be drawninto the casing and forced out thereof by the two reversely actingpistons, so that a continuous flow of water is produced by the pump. Thepum has large capacity in proportlon to size an power required tooperate the same. In its action it will be noiseless and, furthermore,is of simple construction 5 and of comparatively small cost.

What I claim is:

In a pump, the combination with a casing having a segmental piston seat10, of a valved water inlet passage opening into the inter- IO mediateportion of said piston seat, a water outlet passage opening from themain chamber of said casing, reversely acting check valves in saidpiston seat on the opposite sides of said inlet passage, segmentalpistons 15 working in the opposite extremities of said piston seat andprovided with slots 15*, check valves in said pistons, a rock shaftjournaled in the said casing and provided at its outer end with acooperating lever, and an arm secured to said rock shaft within said 20casing, and having reversely extended stems connected to said twopistons, substantially as described.

In testimony whereof we afliX our signature in presence of twowitnesses.

JOHN BERGSTROM. CARL A. VVAHLEEN. Witnesses:

L. N. CLAUsEN, T. O. OSCAR.

